James Willis Simmons, NP
Family Nurse Practitioner · Redwood City, CA
James Willis Simmons, NP is a family nurse practitioner with a practice address in Redwood City, California, and NPI 1366744492, issued on Nov 22, 2010. Check the license (California NP19879, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- James Willis Simmons
- Credential
- NP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- NP19879 CA
Self-reported in NPPES; status is on the state search - Practice location
- 830 Jefferson Ave, Redwood City, CA 94063
- Phone
- (650) 380-0616
- Enumerated
- Nov 22, 2010
- Record last updated
- Jan 16, 2026
- Medicare enrollment
- Enrolled (PECOS I20110614000168); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Also registered at 830 Jefferson Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Willis Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license NP19879Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average family nurse practitioner in 2024
143 Medicare Part D claims for 92 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Azithromycin13 claims
- Prednisone11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Inpatient Specialists OF California PCAntioch, CA
- Merced Intensivist Group IncMerced, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Willis Simmons among 16,966 family nurse practitioner records in California
James Willis Simmons, NP is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 17% of them.
- NPI issued2010 · 17% of these records are older, 81% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2010 · median 2019 among the 6,793 with a school on file
- Record last updated2026 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 family nurse practitioner records list a practice address in Redwood City
They are 37 of the 2,795 NPPES records with a practice address in Redwood City, and 16,966 family nurse practitioner records in California.
All 16,966 in California → Every provider in Redwood City → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Lindsay Arboleda, NPRedwood City, CA 940631780005710
- Vanessa Breen, NPRedwood City, CA 940631497190763
- Betsi Carey, NPRedwood City, CA 940631770671760
- Ruthann Flament, NPRedwood City, CA 940631912097304
- Carrie Gordon, NPRedwood City, CA 940631134498926
- Margaret Hermoso, RN, NPRedwood City, CA 940631568764553
- Laura Hutkins, N.P.Redwood City, CA 940631750440525
- Karen Ketner, NPRedwood City, CA 940631932256617
Common questions
What is James Willis Simmons, NP's NPI number?
James Willis Simmons, NP's National Provider Identifier (NPI) is 1366744492, issued on Nov 22, 2010. An NPI identifies a provider in billing; it is not a license.
Where is James Willis Simmons, NP located?
The NPPES record lists a practice address at 830 Jefferson Ave, Redwood City, CA, 94063. Phone: (650) 380-0616. Providers update this record themselves, so call before visiting.
How can I verify James Willis Simmons, NP's license?
NPPES lists California license number NP19879, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does James Willis Simmons, NP prescribe under Medicare Part D?
In 2024, James Willis Simmons, NP had 143 Medicare Part D claims for 92 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.